The deal means Entain will continue running Scientific Games' OpenGaming ecosystem until 2024.
Entain already holds a portfolio of brands including Ladbrokes, Coral, bwin, Party Casino and Gala.
Scientific Games will also continue supporting Entain’s reach across Europe in regulated markets such as Greece, Italy, Spain, Portugal and the UK.
Valery Gelfman, CPO at Entain, said: “Over a number of years, OpenGaming has been a key component of our online gaming offer, helping to establish it as the world’s biggest and best casino portfolio.
“Extending our partnership with Scientific Games will enable us to continue to build our market share in regulated markets in Europe and beyond.
Dylan Slaney, SVP Gaming, Digital at Scientific Games, said: “Entain is a hugely important customer of ours and we’re delighted the group has entrusted OpenGaming for a further three years.
“With the robust regulatory tools that are embedded within OpenGaming, we’re in the perfect position to provide valuable support for Entain as the group grows its reach within regulated markets”.
